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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Cam Timing Conundrum!
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<blockquote data-quote="davidd" data-source="post: 90229" data-attributes="member: 1177"><p>The bits to do this are not difficult to make. This is one that Pat Manning made. He copied a design that Peter Barker told us about.</p><p></p><p>[ATTACH=full]19094[/ATTACH]</p><p></p><p>You need a cam spindle size spindle to go into a lump. You need a pusher that will hold the cam shaft (right) with a hole that is a little less deep than the cam shaft so you can see it home when you press it in. The harder part is the small spindle to the right of the large spindle. This needs to fit in that groove on your cam. It sits in a hole all the way through the base. It is sitting on a spring, like a ball point pen spring, and put a screw in the bottom to hold the spring, spindle and a spacer if you need one, in place. This spindle should be able to push down flush with the base. The little flange on the bottom of this retracting spindle needs to allow the spindle to poke up higher than the cam gear when it is flat on the base. (The hole is counter bored a bit bigger from the bottom.) When the retractable spindle is all the way up it catches the groove in the camshaft before the cam is pushed into the base. This is what is doing the indexing.</p><p></p><p>What I did next was to slide on a Gary Robinson cam. With the cam locked in place by the retractable spindle, I marked the hole for the drift pin. I figured that Gary knew how to index the cam on a Vincent. With this you are mostly done. I could add another pin where the arrow on the left is pointing for a Comet cam, as that is where the two dots are on the gear for a Comet. You could insert other pins for the twin cams.</p><p></p><p>I would think the repeatability on this is good. But, I also agree with Passenger0_0 that splitting the difference is fine. The indexing tool would be a good item for a Section to own and lend out.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 90229, member: 1177"] The bits to do this are not difficult to make. This is one that Pat Manning made. He copied a design that Peter Barker told us about. [ATTACH=full]19094[/ATTACH] You need a cam spindle size spindle to go into a lump. You need a pusher that will hold the cam shaft (right) with a hole that is a little less deep than the cam shaft so you can see it home when you press it in. The harder part is the small spindle to the right of the large spindle. This needs to fit in that groove on your cam. It sits in a hole all the way through the base. It is sitting on a spring, like a ball point pen spring, and put a screw in the bottom to hold the spring, spindle and a spacer if you need one, in place. This spindle should be able to push down flush with the base. The little flange on the bottom of this retracting spindle needs to allow the spindle to poke up higher than the cam gear when it is flat on the base. (The hole is counter bored a bit bigger from the bottom.) When the retractable spindle is all the way up it catches the groove in the camshaft before the cam is pushed into the base. This is what is doing the indexing. What I did next was to slide on a Gary Robinson cam. With the cam locked in place by the retractable spindle, I marked the hole for the drift pin. I figured that Gary knew how to index the cam on a Vincent. With this you are mostly done. I could add another pin where the arrow on the left is pointing for a Comet cam, as that is where the two dots are on the gear for a Comet. You could insert other pins for the twin cams. I would think the repeatability on this is good. But, I also agree with Passenger0_0 that splitting the difference is fine. The indexing tool would be a good item for a Section to own and lend out. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Cam Timing Conundrum!
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